HOARDING FACTS: Compulsive hoarding cleanup California and USA Cities is a mental disorder marked by an obsessive need to accumulate (and failure to use or get rid of) a significant amount of possessions, even if the items are of no value, hazardous, or gross filth and unsafe items.

It's not clear whether compulsive hoarding is a separate disorder, or rather a symptom of another condition, such as obsessive- compulsive disorder, hoarding unnecessary possessions may be referred to as 'syllogomania'.